Select 'Help content' from the '?' menu
The Notepad++ Reference manual appears
Select the 'Index' tab
Enter 'toolbar' in the Keyword field
Double click on the 'Toolbar' entry in the results list
The Help page for 'Toolbar' appears
The last paragraph of the help sayd :-
"To load custom images for your toolbar, you need a special configuration file and the custom images. To learn how to use these, please see the following link for information:
If you go to specified URL, you are required to Authenticate yourself, with a username and password in order to access the help page.
Help of this nature should not be under restricted access.
Windows XP SP3